(19)

(11)

EP 0 642 674 A1

(12)

(43) Date of publication: 15.03.1995 Bulletin 1995/11 (21) Application number: 93912326.0 (22) Date of filing: 20.04.1993

(51) International Patent Classification (IPC):  B32B 7/ 02( . ) G02B 5/ 28( . ) (86) International application number: PCT/US1993/003713 (87) International publication number: WO 1993/024850 (09.12.1993 Gazette 1993/29)

(84) Designated Contracting States: BE DE FR GB IT NL (30) Priority: 27.05.1992 US 19920888705 (71) Applicant: THE DOW CHEMICAL COMPANY Midland, Michigan 48640 (US)	(72) Inventors: WHEATLEY, John, A. Midland, MI 48640 (US) SCHRENK, Walter, J. Midland, MI 48642 (US) (74) Representative: Burford, Anthony Frederick  W.H. Beck, Greener & Co. 7 Stone Buildings Lincoln's Inn London WC2A 3SZ London WC2A 3SZ (GB)